Headspace crimp vials, ND20. Supplier: VWR Collection. Description: Clear and amber glass vials with a rounded or flat bottom, and volumes from 5 to 20 ml and closures. A rounded bottom vial is more sturdy and resistan ,VWRI548-0799EA,548-1994EA,548-0133EA,548-0891EA,548-0091EA,548-0798EA,548-0055EA.